So if I use an external GPS with the Stratux, the altitude displayed by Foreflight will be from the stratux External GPS rather than the iPad internal GPS? I know I can tell stratux to use the external GPS on the web page at 192.168.10.1, but do I need to tell Foreflight or the iPad itself anything about which GPS (stratux or iPad internal) to use? I've had some confusing results recently. The iPad cellular model internal GPS is fine for navigation, but the altitude display is unreliable. So I'd like to add and use an external GPS with the stratux, but want to make sure I know which GPS Foreflight is displaying. Thanks any help.